Seismic Mode Number Selection Method Based on Dual Index of Top Displacement and Bottom Shear Force
A bottom shear force and displacement technology, which is applied in the fields of earthquake resistance, building types, and electrical digital data processing, can solve problems such as unclear physical meaning, empirical values, and indirect mapping of structural seismic response indicators, etc., to achieve The physical meaning is clear, the seismic design method is scientific, and the effect of overcoming technical difficulties
Active Publication Date: 2021-12-21
QINGDAO TECHNOLOGICAL UNIVERSITY
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However, there are two problems in using 90% as the basis for the selection of the minimum calculation mode shape number: one is that the mapping relationship with the seismic response index of the structure is not direct, and the physical meaning is not clear; the other is that the value of 90% is based on experience sex
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Embodiment 1
[0051] The selection method of the seismic mode number based on the dual indexes of vertex displacement and bottom shear force includes the following steps:
[0052] The first step is to determine the research object, structural scheme and component size, and calculate the structural period and mode shape;
[0053] The second step is to select the seismic influence curve of the seismic code, and determine the seismic influence coefficient α of the j-order structural period according to the structural period of each order j , to calculate the acceleration response spectrum value S of the j-order structural period αj , to calculate the displacement response spectrum value S of the j-order structural period dj ;
[0054] The formula for calculating the acceleration response spectrum spectrum value of the j-order structural period in the step 2 is as follows:
[0055] S αj = α j g
[0056] Among them, g is the acceleration due to gravity;
[0057] The formula for calculatin...
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The invention discloses a method for selecting the number of anti-seismic vibration modes based on the dual indexes of top displacement and bottom shear force, which calculates the top displacement under the j mode mode; calculates the bottom shear force under the j mode mode; , to synthesize the vertex displacement values approximated by multiple modes; to synthesize the bottom shear values approximated by multiple modes; to calculate the minimum calculated mode number based on the vertex displacement and the minimum calculated mode number based on the bottom shear force, and take the two The larger value in is the seismic mode number based on the dual indexes of vertex displacement and bottom shear force; the complete quadratic combination method is used to calculate the seismic mode number based on the dual indexes of vertex displacement and bottom shear force. Improved calculation accuracy for seismic design. Abandoning 90% as the basis for the selection of the minimum calculation mode shape number, on the one hand, the mapping relationship with the seismic response index of the structure is direct, and the physical meaning is clear; The seismic design method is more scientific.
Description
technical field [0001] The invention belongs to the technical field of anti-seismic design, and in particular relates to a method for selecting the number of anti-seismic modes based on dual indexes of apex displacement and bottom shear force. Background technique [0002] The selection of the number of seismic modes directly affects the accuracy of the seismic design of the structure. my country's current "Code for Seismic Design of Buildings (2016 Edition)" stipulates that when calculating the horizontal seismic action (without considering torsion), the general structure can take the 2nd to 3rd order vibration modes. ; When the basic period of the structure is greater than 1.5s or the height-to-width ratio of the building is greater than 5, the number of mode shapes can be appropriately increased; in the "Technical Regulations for Concrete Structures of High-Rise Buildings", it is stipulated that when the structure considers torsion, the number of mode shapes should not be l...
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IPC IPC(8): G06F30/13E04H9/02E04B1/98G06F119/14
CPCE04H9/02G06F30/13
Inventor 刘文锋张华侯红梅
Owner QINGDAO TECHNOLOGICAL UNIVERSITY